Given an array of n integers. We need to count all values of ‘k’ such that
arr % k = arr % k = ....... = arr[n-1] % k
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. Each test case contains an integer n denoting the size of the array. The next line contains n space separated integers.
Print the count of values of k such that each element of array mod k is equal.
1 <= T <= 105
1 <= n <= 105
1 <= a[i] <= 105
38 6 34
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